Sewing-machine



G. S. HILL.

SEWING MACHINE. APPLICATION FILED Aue.2-a. 1916.

Patented Sept. 28,1920.

3 SHEETS-SHEET l.

G. S. HILL.

SEWING MACHINE.

APFLICATIQN FlLED-AUG.28, I916.

Patented Sept. 28, 1920..

' 3 SHEETS.SHEET 2.

G. S. HILL.

SEWING MACHINE.

, APPLICATION FILED AUG-28, I9l6.

1,353,837, Patented Sept 28,1920.

3 SHEETS-SHEET 3- I\\\\ 14- I, 16 I i UITED srAEs' PATENT OFFICE.

GEORGE HILL, OF STRAFFORD, NEW HAMPSHIRE, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY,

-A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Application filed August 28, 1916.

T 0 all whom it may concern:

Be it known that I, GEORGE S. HILL, a citizen of the United States,residing at Strafford, in the county of Strafi'ord and State of NewHampshire, have invented certain new and useful Improvements inSewing-Machines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The invention relates to machines for sewing overseams.

The object of the invention is to provide novel and improved looper andloop spreader mechanism for cooperating with the verticallyreciprocating needle or needles of the sewing mechanism, which willoperate in a uniformly reliable manner, and which is well adapted forhigh speed operation. T 0 this end the invention comprises the featuresof construction and combinations of parts hereinafter described andreferred to in the claims, the advantages of which will be apparent tothose skilled in the art from the following detailed description of themechanisms shown in the accompanying drawings which embody the preferredform of the invention.

In the drawings Figure 1 is a sectional elevation showing so much of abuttonhole sewing machine as is necessary to illustrate the applicationof the present invention thereto; Fig. 2 is a transverse sectionalelevation on line 2, Fig. 1; Fig. 3 is a detail plan view of the turretwhich carries the under sewing mechanism; Fig. 1 is a sectional view online 4, Fig. 3; Figs. 5 to '12 are diagrammatic views showing the modeof operation in forming the overseam stitches; and 'Fig. 13 is a detailsectional view on line 13, Fig. 6.

In the drawings th'e'invention is shown embodied in a buttonhole makingmachine having the same general construction and mode of operation asthe machine shown and described in application Serial No. 104,449, filedJune 19, 1916. The machine comprises in general a cutter which operatesto cut the buttonhole slit after the completion of the sewing, areciprocating and laterally. moving work clamp, and a sewing mechanismwhich is rotated during the sewing about the eye of the buttonhole, and

' Specification of Letters Patent.

Patented Sept. 28, 1920.

Serial No. 117,243.

which comprises a vertically reciprocating and laterally vibrating orjogging upper needle and cooperating looping and loop spreading devicesarranged below the work and including a threadcarrying looper.

In the machine shown the work clamps indicated at 2 are mounted uponworksupporting plates 4 which are pivotally connected with a longitudinallyand laterally moving clamp carriage 6. The clamps are automaticallyclosed at the beginning of the sewing, and are automatically openedafter the completion of the buttonhole, by mechanism which forms no partof the pres ent invention, and which need not be described. Thebuttonhole slit is out after the completion of the sewing by a cutter 8operated by a cam on the main cam shaft of the machine.

In the-embodiment of the invention shown the sewing mechanism is adaptedto form the well-known Humphrey stitch, and comprises a verticallyreciprocating and laterally jogging upper needle 10, a reciprocating andlaterally moving thread carrying looper 12, an alternately actingreciprocating looper 14, and a laterally movable loop spreader 16reciprocating with the loopers and acting to spread the loop taken bythe looper 14. The mode of operation of these devicesin forming theoverseam stitches is illustrated in Figs. 5 to 12. During the depthstroke of the needle, the support or carrier on which the loopers andloop spreader are mounted, is moved in a direction to retract the threadcarrying looper 12, and to-project the end of the looper 14 and theoverlying spreaderpoint 16 through a needle loop thrown out by theneedle as it starts upward from. its lowest position. This loop iscarried toward the left by the looper 141 into the position indicated inFig. 5, "and as it is carried intothis position the spreader point 16 ismoved transversely of the direction of travel of the looper to spreadthe loop, as indicated in Fig. (3, so that during the slit or edgestroke of the needle it will pass down through the loop of upper thread.After the needle has entered the loop the carrier is moved toward theright to withdraw the looper 14 and spreader point 16 from the loop, andto advance the thread carrying looper 12, the spreader point returninginto position above the looper, as indicated in Figs. 7 and 8. Thecontinued movement of the carrier toward the right carries the threadcarrying looper 12 through the loop of needle thread, as indicated inFigs. 9 and 10, after which the needle is retracted. After the threadcarrying looper has carried its thread through the loop of the needlethread it is moved laterally across the needle path, and presents itsloop in position for the passage of the needle therethrough during itsnext depth stroke, as indicated in Fig. :12. In order to secure anadequate spreading of the looper loop, it is preferred to provide thelooper with a lateral projection 18 back of its thread eye. Thisprojection counteracts or partially counteracts the effect of thelateral movement of the looper upon the loop of needle thread throughwhich it is passed, so that the side of the needle loop against whichthe looper thread draws in passing from the eye of the looper to theseam is held in such position that the proper space between the looperthread and the side of the looper is provided for insuring the passageof the needle through the loop of looper thread. After the needle haspassed through the loop of looper thread, the carrier is again movedtoward the left to withdraw the thread carrying looper and again advancethe looper 14 and spreader point 16 to take a loop of the ,upper threadfrom the needle, spread it, and present it in position for the passageof the needle during its next slit stroke. Prior to its next advancemovement the thread carrying looper is moved laterally into position 'topass on the front side of the needle and through the needle loop, asabove described.

Any suitable construction for giving the looper and loop spreader themovements de scribed may be employed, but it is preferred to employ theconstruction shown, or a similar construction, since this enables theparts to be operated at high speed, and is also Well adapted for use inamachine in which the loopers and spreader are mounted upon a rotaryturret. In the construction shown the looper point 14 is secured in thearm 20 of a carrier 22 which is provided with two bearings mounted toturn on the inner ends,

of studs 24 which are secured in lugs projecting from the upper edge ofthe rotary turret 26. The spreader point 16 and thread carrying looper12 are secured in the ends of two arms of a carrier lever 28 which ismounted on a pivot 30 on the carrier 22, arranged at right angles to theaxis of the carrier and between the ends of the carrier pivot studs 24.The lever is provided with a horizontal arm arranged substantially inthe axis of the carrier 22, and having. its outer end connected by aball and socket joint to the u per end of a tubular link 32, the lowerem of which is connected by a ball joint to the forward end of a lever34 through which the lever is rocked to give the spreader point andthread carrying looper the lateral movements above described. Thecarrier 22 is oscillated to advance and retract the loopers and loopspreader. through a lever 36 connected with the carrier through atubular link' 38, the lower end of which is connected with the lever bya ball joint, and the upper end of which is pivotally connected at 40with the carrier.

The-lever 36 is rocked by a three-corneredeccentric 42 secured to thesewingshaft at, and engaging a fork on the upper end of the link 46, thelower end of which is connected to the lever. The lever 34 is rocked tooscillate the carrier lever 28 during the movement of the carrier lever22 in each direction, by an eccentric on the needle shaft 48 whichengagesthe upper end of a link 50, the lower end of which is connectedto the lever. The needle shaft 48 is connected with the sewing shaft 44by gearing through which the needle shaft is given two revolutions foreach revolution of the sewing shaft.

The mechanism for vibrating or jogging the needle 10 comprises a carriersleeve 52 within which the needle bar 54: reciprocates. The lower end ofthe carrier sleeve is connected by a link'56 to arelatively fixed pivot58 which is carried on a rotary head 60. The upper end of the sleeve isconnected to the horizontal arm of a bell crank lever 62 by a balljoint. The vertical arm of the bell crank lever is connected to theforward end of a rod 64 by an adjustable. pivot block 66. The rear endof therod is provided with an eccentric strap engaging an eccentric onthe sewing shaft. When the carrier sleeve is moved downward, the link 56will act to swing the lower end of the carrier and the needle bar towardthe. right, so that the needle will be in position to form the depthstitch. When the carrier sleeve is raised, the link will act to swingthe sleeve toward the left, thus bringing the needle into position toform the slit or edge stitch. The needle bar is reciprocated by a crank68 on the needle shaft 48, and since this shaft makes two revolutionsfor each revolution of the sewing shaft, the eccentric on thesewingshaft lll ' of which is provlded with an arm carrying a roll engaged bya cam on the cam shaft of the machine.

While the invention has been shown and described as embodied in amachine for sewing a two-thread overseam, in which-the upper thread iscarried by a transversely vibrating needle, and in which the sewingmechanism is mounted for rotation during the sewing, it will beunderstood that the invention isnot confined in its application to sucha machine, but may be embodied with advantage in other types ofmachines. It will also be understood that the broader features of theinvention are not limited te the specific construction shown anddescrlbed,

but may be embodied in other structures, the

specific construction and arrangement of the parts being varied ormodified as found desirable or best suited to the machine 1n which theinvention is to be embodied.

Having explained thenature and object ofthe invention and specificallydescribed one form of mec anism in which it may be embodied, what isclaimed is.:-

1. A sewing machine, having, in combination, an upper needle mechanismabove the work, a thread carrying looper mounted to reciprocate and tomove transversely of the needle below the work, an opposed andalternately acting looper, and a spreader point moving with andtransversely of the second looper.

2. A sewing machine, having, in combination, an upper needle mechanismabove the work, a reciprocating carrier below the work, a thread carrymgand an opposed non-thread carrying looper carried on the carrier, a loopspreader point cooperating with the non-thread carrying looper, and

. mechanism for moving the thread carrying looper and the spreader pointtransversely during each reciprocation of the carrier.

3. A sewing machine, having, in combination, a reciprocating andlaterally jogging upper needle, two opposed looper points below thework, one of which carries a thread,

-mechanism for reciprocating the looper points and for moving the threadcarrymg looper across ,the needle .path, and a loop spreader pointmoving with and transversely of the other looper point.

4. A sewingmachine, having, in combination, an upper needle mechanismabove the work, a reciprocating support below the work, a carriermounted to move with and transversely of the support, a single looper onthe support, and a cooperating loop spreader and an opposed looper onthe carrier.

5. A sewing machine, having, in combination, an upper needle mechanlsmabove the work, two opposed looper points below the work, mechanism forreciprocating the looper points to alternately enterthe needle loops, aloop spreader point arranged to enter a needle loop with one of thelooper points, and mechanism for moving the spreader point transverselyto spread the needle loop entered by the corresponding looper point andfor moving the other looper point transversely across the needle pathwhen through a needle loop.

6. .A sewing machine, having, in combination, an upper needle mechanismabove the work, a reciprocating carrier below the work, two opposedloopers on the carrier, a loop spreader cooperating with one of theloopers, mechanism for moving the other looper transversely of theneedle to shift its loop bodily into position for the passage of theneedle therethrough, and for moving the spreader transversely of theneedle to spread the loop carried by the cooperating looper for thepassage of the needle therethrough.

7. A sewing machine, having, in combination, an upper needle mechanismabove the work, a carrier below the work mounted to oscillate withrelation to the needle, a transversely movable carrier moving with theoscillating carrier, a single looper point on the oscillating carrier,and a cooperating spreader point and=an opposed looper point on thetransversely movable carrier.

8. A sewing machine, having, in combination, an upper needle mechanismabove the work, a support below the work mounted to oscillate withrelation to the needle, a

. carrier mounted on the support to oscillate about an axissubstantially at right angles to the axis of the support, a singlelooper point on the oscillating support, a cooperating loop spreaderpoint and an opposed looper point on the,carrier, and mechanism foroscillating the support and for oscillating the carrier on the support.

9. A sewing machine, havin in combination, an upper needle mechamsmabove the work, a reciprocating and transversely movingthread carryinglooper provided with a lateral projection back of its'thread eye todeflect the loop entered by the looper, an opposed reciprocating looper,and means cooperating therewith to spread the loop entered thereby.

10. A sewing machine, having, in com- -bination, an upper needlemechanism above point moving with and transversely of the other looperpoint.

GEORGE s. HILL.

